[java] Change classpath logic to handle paths relative to project root
[java] Change classpath logic to handle paths relative to project root

Summary: For classpath computation, assume relative paths are relative to project root.

Reviewed By: jeremydubreil

Differential Revision: D7331496

fbshipit-source-id: e1bddc8

jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer,jvillard/infer,jvillard/infer,jvillard/infer,facebook/infer,facebook/infer,facebook/infer,facebook/infer,jvillard/infer